新疆艾比湖地区不同土地利用类型土壤养分及活性有机碳组分研究

发布时间：2018-08-25 11:05

【摘要】：土壤有机碳及其组分是土壤质量的重要指标,在土壤许多物理、化学和生物特性中发挥着重要作用。通过对我国内陆荒漠自然生态系统中新疆艾比湖地区不同土地利用类型土壤进行采样和分析,系统地研究和比较了不同土地利用类型土壤养分及有机碳组分。结果表明:新疆艾比湖不同土地利用类型土壤总孔隙度与土壤容重变化趋势相反。不同土地利用类型对土壤养分具有较大影响,土壤有机碳、全氮、全磷和全钾均呈现出一致性规律,大致表现为林地草地耕地未利用地,而不同土地利用类型土壤全磷差异并不显著(p0.05)。不同土地利用类型土壤易氧化有机碳(EOC)、颗粒有机碳(POC)、轻组有机碳(LFOC)、水溶性有机碳(WSOC)、土壤微生物量碳(MBC)和微生物量氮(MBN)均呈现出一致性规律,大致表现为林地耕地草地未利用地。林地和草地EOC/SOC比例显著低于耕地和未利用地,说明林地和草地转变成耕地降低了土壤有机碳的稳定性;微生物商(MBC/SOC)基本表现为耕地林地草地未利用地,其中耕地和林地土壤MBC/SOC比例差异不显著(p0.05)。相关性分析表明,土壤活性有机碳各组分与SOC,TN,TK均具有极显著相关性关系,并且不同土地利用类型土壤EOC,POC,LFOC,WSOC和MBC含量之间均具有极显著相关性(p0.05),说明土壤活性有机碳很大程度上依赖于有机碳含量,活性有机碳各组分之间相互影响和密切联系,其中SOC,TN和TK是不同土地利用类型土壤活性有机碳变化的重要影响因子。
[Abstract]:Soil organic carbon and its components are important indicators of soil quality and play an important role in many physical, chemical and biological properties of soil. The soil nutrients and organic carbon components of different land use types in Ebinur Lake region of Xinjiang were studied and compared systematically by sampling and analyzing the natural ecosystem of inland desert in China. The results showed that the change trend of soil total porosity and soil bulk density in different land use types of Ebinur Lake, Xinjiang was opposite. Soil organic carbon, total nitrogen, total phosphorus and total potassium all showed the same regularity, which showed that the unused land of woodland and grassland was the most important factor in different land use types, and soil organic carbon, total nitrogen, total phosphorus and total potassium had the same regularity. However, there was no significant difference in total phosphorus among different land use types (p0.05). Soil microbial biomass C (MBC) and microbial biomass nitrogen (MBN) of organic carbon (LFOC),) water-soluble organic carbon (WSOC),) light groups of organic carbon (EOC),) particle organic carbon (POC),) were consistent with each other in different land use types. The ratio of EOC/SOC in forestland and grassland was significantly lower than that in cultivated land and unused land, indicating that the conversion of woodland and grassland to cultivated land reduced the stability of soil organic carbon, and the microbial quotient (MBC/SOC) was basically shown as the unused land of cultivated land and grassland. There was no significant difference in the proportion of MBC/SOC between cultivated land and woodland (p0. 05). Correlation analysis showed that there was a significant correlation between soil active organic carbon components and SOC,TN,TK. There was a significant correlation between soil EOC,POC,LFOC,WSOC and MBC content in different land use types (p0.05), which indicated that soil active organic carbon depended on organic carbon content to a great extent, and the components of active organic carbon affected each other and were closely related to each other. Among them, SOC,TN and TK are important influencing factors of soil active organic carbon change in different land use types.
【作者单位】：巴音郭楞职业技术学院;新疆库尔勒市香梨研究中心;
【分类号】：S153.6;S158

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